Hi, I have a question about protective MBR. Thanks a lot for your time. Why is the StartingCHS of protective MBR partition record set to 0x000100 in RedHat / Ubuntu? While UEFI spec defines it as 0x000200. Problem Statement: I met a problem when trying to use FatPei to fetch a file on the GPT partition of RedHat/Ubuntu in TCB. FatPei has a check about Partition Record of protective MBR: StartingCHS should to 0x000200. But I find the StartingCHS in both RedHat and Ubuntu is 0x000100, so that the check fails. According to UEFI spec, StartingCHS should be 0x000200. [cid:image001.png@01D4FACC.71570DF0]